题目内容
若a、b为实数,且满足(a-1)2+
=0,则
+
+
+…+
=( )
| b-2 |
| 1 |
| ab |
| 1 |
| (a+1)(b+1) |
| 1 |
| (a+2)(b+2) |
| 1 |
| (a+2008)(b+2008) |
A.
| B.
| C.
| D.
|
∵a、b为实数,满足(a-1)2+
=0,
又无论a,b为何值,(a-1)2≥0,
≥0,
∴a-1=0,b-2=0,
∴a=1,b=2,
∴
+
+
+…+
=
+
+
+…+
=1-
+
-
+
+…+
-
=
.
故选D.
| b-2 |
又无论a,b为何值,(a-1)2≥0,
| b-2 |
∴a-1=0,b-2=0,
∴a=1,b=2,
∴
| 1 |
| ab |
| 1 |
| (a+1)(b+1) |
| 1 |
| (a+2)(b+2) |
| 1 |
| (a+2008)(b+2008) |
=
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 2009×2010 |
=1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2009 |
| 1 |
| 2010 |
=
| 2009 |
| 2010 |
故选D.
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